We're using another tactic when looking for competitiveness of a keyword at the moment as the Keyword Tool is just so vague.

By using an 'allintitle:' search for each of the keywords in Google you can see how many other sites have used the keyword in the title which shows that they are also targeting that word (directly or indirectly).

We then put all the results in a spreadsheet and create a ratio between number searches/allintitle results. The one with the highest ratio, and a decent number of searches, wins and is what we'll target.